Mr. Rehm had invented and built the Myopter optical viewer in 1972, and introduced it to the optometric profession at the 1973 Annual Meeting of the American Academy of Optometry in San Francisco. His paper, "The Myopter Viewer: An Instrument for Preventing, Improving and Eliminating Acquired Myopia", was subsequently published in the American Journal of Optometry and Physiological Optics.

On May 13, 1975, he obtained U.S. Patent No. 3,883,225 on the Myopter.

In 1981, Mr. Rehm published a book entitled “The Myopia Myth” on the subject of myopia prevention which is available through IMPA.